: Covers the physiological, psychological, and musical aspects of the voice.

: Offers an objective look at singing without being tied to one specific "school" of technique.

There are also visual "pieces" or companion materials that demonstrate the book's concepts:

: A 20-minute presentation (originally from 1987) illustrating the vibratory cycle and "registers" using views of the normal female larynx.

: Explains how body alignment and mental attitude affect breathing and healthy singing.